Solve the following pair of linear equations by the substitution method.
(i) x + y= 14 (ii) s – t =3
x – y = 4
s
t
6
3 2
(iii) 3x – y = 3 (iv) 0.2x+ 0.3y= 1.3
9x – 3y = 9 0.4x+ 0.5y= 2.3
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